@ThorstenStr that is an interesting observation! I have also found that even though you upgrade the firmware and let the device do a typical reboot, sometimes you have to power down the device or...

@DannyZ a few of us had a similar issue with the 605 release 1.2.1 and TP came out with a minor release to resolve that back when I was running 5.5.7 I am running 5.6.4 on the OC200 and still running...

@lukass2000 if you disable the loopback protection you risk storming the network and taking it down so you cant do anything. The loopback detect at least will shut down the port, stop the storm and...

@lukass2000 As you can see, if you set it up for loopback, it will detect a loop and shut down the port. When using RSTP it will look to see which path to keep active and which path to block so that...

@lukass2000 priority should be fine. For a simple network like yours, it wont make a difference. Larger networks would maybe require a different priority depending on which path you want to be the...

@lukass2000 For now I would recommend that you keep RSTP active on all managed switches and watch the alarms to see if any other port complains of a loop or blocking. It doesnt hurt to keep that...